Wheel cap



FIG. 1 is a perspective view of the wheel cap of my new design; and,

FIG. 2 is a front elevation view thereof.

The top, bottom, left-side, and right-side views have been omitted insofar as these views relate to the tire mounted on the wheel; the tire does not form part of the claimed design. The back view of the cap has been omitted insofar as this view does not form part of the claimed design. The features shown in broken lines in FIGS. 1 and 2 are for illustrative purposes only and do not form part of the claimed design. 

The ornamental design for a wheel cap, as shown and described. 